笔记

1、java多版本切换命令

[root@harbor-jenkins yum.repos.d]# update-alternatives --config java
There are 2 programs which provide 'java'.
  Selection    Command
-----------------------------------------------
*+ 1           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64/jre/bin/java)
   2           java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.21.0.9-1.el7_9.x86_64/bin/java)
Enter to keep the current selection[+], or type selection number: 2
[root@harbor-jenkins yum.repos.d]# java -version
openjdk version "11.0.21" 2023-10-17 LTS

 2、指定K8S nodeport端口范围

- --service-node-port-range=10000-65535   #写入kube-apiserver.yaml文件中

 3、nvidia

wget https://developer.download.nvidia.com/compute/cuda/11.8.0/local_installers/cuda-repo-rhel7-11-8-local-11.8.0_520.61.05-1.x86_64.rpm
rpm -i cuda-repo-rhel7-11-8-local-11.8.0_520.61.05-1.x86_64.rpm
yum -y install nvidia-driver-latest-dkms
yum -y install cuda
nvidia-cuda-mps-control -d   #表示开启mps

 4、core文件修改默认位置

echo "/tmp/cores/core.%h.%e.%p.%t" > /proc/sys/kernel/core_pattern
mkdir /tmp/cores

 5、查询当前终端公网ip

curl -s https://api.ipify.org   #任选一种即可
wget -qO- https://api.ipify.org
curl ip.sb
nslookup myip.opendns.com resolver1.opendns.com

 5、查看一个时间范围内的pod或ns事件

kubectl get events --namespace rtvt -o json | jq '.items[] | select(.metadata.creationTimestamp >= "2024-01-25T09:00:00Z")'

 6、jdk11 yum安装

yum install java-11-openjdk-devel